77387390 has 8 divisors (see below), whose sum is σ = 139297320. Its totient is φ = 30954952.

The previous prime is 77387371. The next prime is 77387393. The reversal of 77387390 is 9378377.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77387393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3869360 + ... + 3869379.

It is an arithmetic number, because the mean of its divisors is an integer number (17412165).

Almost surely, 2^77387390 is an apocalyptic number.

77387390 is a deficient number, since it is larger than the sum of its proper divisors (61909930).

77387390 is a wasteful number, since it uses less digits than its factorization.

77387390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7738746.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 77387390 is about 8797.0102875920. The cubic root of 77387390 is about 426.1443485051.

It can be divided in two parts, 77387 and 390, that added together give a palindrome (77777).

The spelling of 77387390 in words is "seventy-seven million, three hundred eighty-seven thousand, three hundred ninety".